Do we say “He roared his motorbike noisily to show people that how cool he is”?

Question

There are some young people with low self-esteem, they often speed up their motorbikes suddenly make a deep, very loud noise and to show off or to get attention.

Can we use the verb "roar" to express that?

roar 4 [intransitive always + adverb/preposition] if a vehicle roars somewhere, it moves very quickly and noisily

The car roared off down the road.

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So we say "His motorbike roared off down the road." but the verb is an intransitive and not a transitive verb.

can we say "He roared his motorbike noisily to show people that how cool he is"?

or are there any other ways to express it?

Answer 1

Another way to express it: "He revved his motorbike noisily."

American Heritage Dictionary "rev" 1a

a. To increase the speed of (a motor, for example): revved the engine.

The word "noisily" already conveys the sonic nuisance.
Another possibility: "He revved his motorbike [aggressively], making the engine roar."